JP3561598B2 - Compressors and air conditioners - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a variable capacity compressor and an air conditioner including the compressor, and relates to a technique for achieving multi-stage capacity control while reducing energy consumption.
[0002]
[Prior art]
In recent years, in order to prevent overshooting and hunting at room temperature during cooling and heating, air conditioners that perform capacity control on the heat source side (compressor) according to the capacity requirements of the user side (indoor heat exchanger) are the mainstream. It has become. As a method of controlling the capacity of a compressor, there are many methods in which the frequency of an alternating current is converted using an inverter device, and thereby the driving speed of the compressor is linearly controlled. According to this method, since the capacity of the compressor can be arbitrarily varied from 0 to the rated point, substantially perfect air conditioning control can be realized. However, the inverter device has various problems, such as the inevitable energy loss due to the frequency conversion, emission of undesired electromagnetic waves to the environment, and increase in device cost for large-sized devices.
[0003]
Thus, Japanese Patent Application Laid-Open No. 8-247560 and the like disclose a variable-capacity constant-speed compressor in which the power is controlled by a power save mechanism and a refrigerant return circuit while using a constant-speed compressor having a compression mechanism driven at a constant speed. Has been proposed. The power save mechanism has a valve device attached to a cylinder side wall or the like of the compression mechanism. By opening the valve device, for example, compression work in the first half of the compression stroke is not performed. Further, the refrigerant return circuit, for example, by providing a bypass circuit between the discharge-side refrigerant circuit and the suction-side refrigerant circuit of the compressor, and by opening a valve device interposed in this bypass circuit, the compressed refrigerant Is recirculated to the suction side refrigerant circuit.
[0004]
When a variable-capacity constant-speed compressor and a normal constant-speed compressor are combined, multi-stage capacity control can be achieved by operating or stopping both compressors individually, or by using a power save mechanism or refrigerant return circuit. It becomes possible. For example, the rated capacity of the variable capacity constant speed compressor is 4 hp, the rated capacity of the constant speed compressor is 6 hp, the capacity reduction amount of the variable capacity constant speed compressor by the power save mechanism is 2 hp, and the refrigerant return circuit. Assuming that the power reduction amount is 1 horsepower, the power is switched every one horsepower (that is, in 10 steps) in the range of 1 to 10 horsepower.
[0005]
[Problems to be solved by the invention]
By the way, when the above-described refrigerant return circuit is opened, a part of the compressed refrigerant flows back to the suction-side refrigerant circuit, so that the compressor performs useless compression work. For example, when operating at a capacity of 9 hp, the compression work of 1 hp is discarded by the refrigerant return circuit, but the energy consumption is substantially the same as when operating at a capacity of 10 hp. As a result, an energy loss equal to or greater than that of the inverter device occurs, which has been a factor that makes it difficult to employ a variable capacity constant speed compressor. In addition, although consideration was given to performing the capacity control only by the power saving mechanism without providing the refrigerant return circuit, in that case, in the above-described compressor configuration, the capacity switching is performed every two horsepower (that is, five stages). Would. For this reason, in the air conditioner, when the capacity demand on the user side is small (for example, about 1 to 3 horsepower), overshooting or hunting at room temperature occurs, which may impair the user's comfort in the air-conditioned space. there were.
[0006]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a compressor that achieves multi-stage capacity control while reducing energy consumption and the like, and an air conditioner that includes the compressor. And
[0007]
[Means for Solving the Problems]
In view of the above, the invention according to claim 1 has a plurality of compression elements including a rotor that rotates eccentrically in a cylinder and a vane that slides on an outer peripheral surface of the rotor to define a suction space and a compression space. And a communication passage for allowing a compression space of one compression element to communicate with a suction space of another compression element at a predetermined phase, and a communication passage inside the communication passage. And a power saving means including a check valve provided in the communication passage for blocking the flow of the fluid in the above, and a check valve for allowing the fluid to pass only in one direction.
[0008]
According to the present invention, when the shut-off valve of the power save means is closed, all compression work is performed in each compression element, and the compressor is operated at the rated capacity. Further, when the shut-off valve is opened, the fluid flows out of the compression space of one compression element only to the suction space of the other compression element due to the action of the check valve provided in the communication passage, and the compressor saves power. It is operated in the state where it was done.
[0009]
Further, according to the invention of claim 2, the compressor has a plurality of compression elements including a rotor eccentrically rotating in a cylinder and a vane slidingly contacting the outer peripheral surface of the rotor to define a suction space and a compression space. A double rotor type compressor in which the displacement volumes of the compression elements are different from each other, provided with at least one of the compression elements and provided with a compression stop means for communicating the suction space and the compression space of the compression element. Suggest.
[0010]
According to the present invention, when the compression stopping means does not operate, all compression work is performed in each compression element, and the compressor is operated with the rated capacity. Further, when the compression stop means provided in a certain compression element is operated, no compression work is performed in the compression element, and the compressor is operated in a state where the capacity according to the displacement volume of the compression element is saved. .
[0011]
According to the third aspect of the present invention, there are provided a plurality of compression elements including a rotor which rotates eccentrically in a cylinder and a vane which slides on an outer peripheral surface of the rotor to define a suction space and a compression space. And a communication passage for allowing a compression space of one compression element to communicate with a suction space of another compression element at a predetermined phase, and a communication passage inside the communication passage. A shutoff valve that shuts off the flow of fluid in the power passage means provided in the communication path, and a check valve that allows the fluid to pass in only one direction; and a power saving means provided in at least one of the compression elements. There is proposed a device provided with a compression stopping means for communicating the suction space of the compression element with the compression space.
[0012]
According to the present invention, the compressor is operated not only with the rated capacity but also with the capacity saved in a plurality of stages depending on the operation states of the power saving means and the compression stopping means.
[0013]
According to a fourth aspect of the present invention, there is provided an air conditioner including the compressor according to any one of the first to third aspects.
[0014]
According to the present invention, for example, a constant speed compressor having two compression elements is provided in the outdoor unit, and the constant speed compressor is provided with power saving means for moving the refrigerant between the two compression elements. A compression stop means is provided for each. Thereby, by performing drive control of both the constant speed compressors and drive control of the power saving means and the compression stop means, multi-stage capacity control is realized without providing a refrigerant return circuit which causes energy loss. You.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of an air conditioner including one outdoor unit 1 and a plurality of indoor units 3, in which a solid line indicates a refrigerant circuit, and a dashed line indicates an electric circuit. is there.
[0016]
On the outdoor unit 1 side, a compressor 5, an electromagnetic four-way valve 9, an outdoor heat exchanger 11, an electric fan 13, an accumulator 15, an oil separator 17, and the like are installed. On the indoor unit 3 side, an electric expansion valve 21, an indoor heat exchanger 23, an electric fan 25 and the like are installed. The equipment that constitutes the refrigerant circuit is connected by refrigerant pipes 31 to 48 that are used to distribute gas refrigerant or liquid refrigerant. In the figure, reference numeral 27 denotes a normally closed solenoid on-off valve (hereinafter, referred to as a first solenoid valve), and reference numeral 29 denotes a three-position, three-port solenoid switching valve (hereinafter, referred to as a second solenoid valve). Used for driving the save mechanism.
[0017]
In the outdoor unit 1, an outdoor control unit (hereinafter, referred to as an outdoor ECU) 51 including a CPU, an input / output interface, a ROM, a RAM, and the like is provided. The outdoor ECU 51 drives and controls the compressors 5 and 7, the four-way valve 9, the electric fan 13, and the first and second solenoid valves 27 and 29 based on input information from a built-in control program and various sensors (not shown). I do.
[0018]
On the other hand, in the indoor unit 3, an indoor control unit (hereinafter, referred to as an indoor ECU) 52 including a CPU, an input / output interface, a ROM, a RAM, and the like is provided. The indoor ECU 52 controls the driving of the electric expansion valve 21 and the electric fan 25 based on input signals from a built-in control program, a remote controller (not shown), various sensors, and the like. Give and receive.
[0019]
In the case of the present embodiment, the compressor 5 is an electric twin rotor type constant speed compressor having a pair of upper and lower rotary compression elements, and its rated output is set to 4 horsepower. Further, the compressor 5 is provided with a power save mechanism shown in FIG. 2 and a compression stop mechanism shown in FIG. 4, and the compression work of the compressor 5 is switched to eight stages by their operation.
[0020]
Hereinafter, the structure and operation of the power save mechanism according to the present embodiment will be described.
[0021]
The compression mechanism 61 of the compressor 5 includes a pair of upper and lower cylinders 69, 70 sandwiched between a main frame 65 and a bearing plate 67, and a pair of upper and lower cylinders 69, 70 and an intermediate plate, as shown in FIG. A pair of upper and lower cylinder chambers 73, 75 defined by 71, and a pair of upper and lower rotors 77, 79 which are eccentrically rotated 180 ° apart from each other along the inner peripheral surfaces of the two cylinder chambers 73, 75. .
[0022]
In the case of the present embodiment, both rotors 77 and 79 have the same diameter, but the ratio of the total height of the upper rotor 77 to the total height of the lower rotor 79 is set to 1: 3. Accordingly, the ratio of the displacement volumes of the two rotors 77 and 79 in the upper cylinder chamber 73 and the lower cylinder chamber 75 is also 1: 3, the upper rotary compression element has a rated output of 1 hp, and the lower rotary compression element has It will have a rated output of 3 horsepower. In the figure, reference numeral 80 denotes a compressor casing.
[0023]
The power save mechanism 81 connects the two cylinder chambers 73 and 75 at a predetermined communication portion (a portion that is 180 ° out of phase with a vane described later). A communication hole 83 perforated along the direction, a first valve hole 85 communicating the upper cylinder chamber 73 with the communication hole 83, and a second and third valve holes 87 communicating the lower cylinder chamber 75 with the communication hole 83. , 89 as communication paths.
[0024]
As shown in FIG. 3 (a cross-sectional view taken along the line AA in FIG. 2), spool valve holes 91 are formed in the valve holes 85, 87, 89 so as to intersect in the horizontal direction. A spool valve 92 and a valve spring (compression coil spring) 93 are housed in the hole 91. A refrigerant gas introduction hole 94 is formed at the right end of the spool valve hole 91, and the first to third power save pipes 44, 46, 47 are formed in the respective spool valve holes 91 through the refrigerant gas introduction hole 94. Refrigerant gas is introduced.
[0025]
In the case of the present embodiment, the valve holes 85, 87, 89 are closed by the large-diameter portion 95 of the spool valve 92 when the low-pressure refrigerant gas is introduced from the refrigerant gas introduction hole 94. Then, when a refrigerant gas having a high pressure equal to or higher than a predetermined value (for example, 10% of the maximum discharge pressure of the compressor 5) is introduced from the refrigerant gas introduction hole 94, the valve spring 93 is compressed as shown in FIG. As a result, the spool valve 92 moves to the left, and the valve holes 85, 87, 89 are opened via the small diameter portion 96 of the spool valve 92. In the figure, reference numeral 97 denotes a screw plug.
[0026]
The second valve hole 87 and the third valve hole 89 are provided with reed valve type check valves 98 and 99, respectively. The check valve 98 in the second valve hole 87 is connected to the lower cylinder chamber 75 from the lower cylinder chamber 75. The gas refrigerant flows only through the communication hole 83, and the check valve 99 in the third valve hole 89 allows the gas refrigerant to flow only from the communication hole 83 to the lower cylinder chamber 75.
[0027]
The above-described first solenoid valve 27 is interposed between first and second bypass pipes 42 and 43 that communicate the discharge-side refrigerant pipe 31 and the suction-side refrigerant pipe 41 of the compressor 5. The first power save pipe 44 communicating with the refrigerant gas introduction hole 94 on the first valve hole 85 side is connected to the first bypass pipe 42 to reduce the flow rate of the gas refrigerant upstream of the connection portion. Is provided.
[0028]
On the other hand, the second solenoid valve 29 is a three-position three-port switching solenoid valve as described above. The first to third ports communicate with each other at the first position, and the first and second ports at the second position. And the first port and the third port at the third position. The first port of the second solenoid valve 29 is connected to a refrigerant pipe 45 branched from the first power save pipe 44, the second port is connected to the second power save pipe 46, and the third port is connected to the first power save pipe 46. 3 power save piping 47 is connected.
[0029]
In the present embodiment, when the power save mechanism 81 is operated, the outdoor ECU 51 closes the first solenoid valve 27 to cut off the communication between the first bypass pipe 45 and the second bypass pipe 46. Then, the high-pressure refrigerant gas from the discharge-side refrigerant pipe 31 is introduced into the spool valve hole 91 on the first valve hole 85 side via the first bypass pipe 42 and the first power save pipe 44, and as described above, the spool The first valve hole 85 is opened by operating the valve 92.
[0030]
At the same time as the closing of the first solenoid valve 27, the outdoor ECU 51 switches the second solenoid valve 29 to any one of the first to third positions. For example, when the second solenoid valve 29 is switched to the first position, the high-pressure refrigerant gas introduced into the first power save pipe 44 passes through the second and third power save pipes 46 and 47 to the second and third power save pipes 46 and 47. It is introduced into the spool valve hole 91 on the third valve hole 87, 89 side, and the second and third valve holes 87, 89 are opened. In this state, the upper cylinder chamber 73 and the lower cylinder chamber 75 communicate with each other through the valve holes 85, 87, 89 and the communication hole 83, and the other cylinder chamber 75 is compressed from the compression space of one cylinder chamber 73 (75). The gas refrigerant flows out into the suction space of (73), and half of the compression work in both cylinder chambers 73 and 75 (that is, 50% = 2 horsepower as a whole of the compression mechanism 61) is saved.
[0031]
When the outdoor ECU 51 switches the second solenoid valve 29 to the second position, the high-pressure refrigerant gas introduced into the first power save pipe 44 is supplied to the second power save pipe 46 via the second power save pipe 46. The second valve hole 87 is opened by being introduced into the spool valve hole 91 on the hole 87 side. In this state, the upper cylinder chamber 73 and the lower cylinder chamber 75 communicate with each other via the first and second valve holes 85 and 87 and the communication hole 83, and the check valve 98 operates to move the upper cylinder chamber 73 from the compression space of the lower cylinder chamber 75. The gas refrigerant flows out only into the suction space of the upper cylinder chamber 73, and half of the compression work in the lower cylinder chamber 75 (that is, 37.5% = 1.5 horsepower for the compression mechanism 61 as a whole) is saved.
[0032]
Further, when the outdoor ECU 51 switches the second solenoid valve 29 to the third position, the high-pressure refrigerant gas introduced into the first power save pipe 44 passes through the third power save pipe 47 to the third valve. The third valve hole 87 is opened by being introduced into the spool valve hole 91 on the hole 89 side. In this state, the upper cylinder chamber 73 and the lower cylinder chamber 75 are communicated through the first and third valve holes 85 and 89 and the communication hole 83, and the check valve 99 acts to move the upper cylinder chamber 73 out of the compression space of the upper cylinder chamber 73. The gas refrigerant flows out only into the suction space of the lower cylinder chamber 75, and half of the compression work in the upper cylinder chamber 73 (that is, 12.5% = 0.5 horsepower as a whole of the compression mechanism 61) is saved.
[0033]
On the other hand, when stopping the power save mechanism 81, the outdoor ECU 51 opens the first solenoid valve 27 and switches the second solenoid valve 29 to the first position. Then, each spool valve hole 91 communicates with the suction side refrigerant pipe 43 via the first to third power save pipes 44, 46, 47 and the second bypass pipe 43. Since the supply of the high-pressure refrigerant gas from the first bypass pipe 42 is very small due to the action of the capillary tube 49, the high-pressure gas refrigerant in each spool valve hole 91 flows out to the suction-side refrigerant pipe 43, and the spool valve 92 returns to the original position, and the first to third valve holes 85, 87, 89 are closed.
[0034]
Thus, the compression work in both the cylinder chambers 73 and 75 is all performed, and the compressor 5 generates a rated output (4 horsepower in the present embodiment). When the capillary tube 49 is communicated via the first and second bypass pipes 42 and 43, the amount of the high-pressure refrigerant gas flowing from the discharge-side refrigerant pipe 31 to the suction-side refrigerant pipe 41 is extremely reduced. There is also action.
[0035]
Next, the structure and operation of the compression stop mechanism according to the present embodiment will be described.
[0036]
A compression stop mechanism 101 is incorporated in both cylinders 69 and 70 of the compressor 5 as shown in FIG. The compression stop mechanism 101 includes an electromagnetic stopper 103 embedded in each of the cylinders 69 and 70, and a locking recess 107 formed in the vane 105. The electromagnetic stopper 103 has a built-in solenoid type actuator (not shown), and when activated, the lock pin 109 projects leftward in FIG.
[0037]
During normal operation, as shown in FIG. 4, the lock pin 109 of the electromagnetic stopper 103 and the locking recess 107 of the vane 105 are separated, and the vane 105 is rotated by a vane spring (not shown). Is pressed against the outer peripheral surface. Thus, the upper cylinder chamber 73 (lower cylinder chamber 75) is defined by the suction space 121 and the compression space 123, and the compression work is performed with the rotation of the rotor 77 (rotor 79).
[0038]
However, when the electromagnetic stopper 103 is driven by the drive current from the outdoor ECU 51 (the solenoid is excited), the lock pin 109 projects leftward in the figure as shown in FIG. It fits into the stop recess 107. As a result, the vanes 105 do not protrude from the inner peripheral surface of the upper cylinder 69 (the lower cylinder chamber 75), and the upper cylinder chamber 73 (the lower cylinder chamber 75) does not suck or compress the refrigerant at all.
[0039]
Thus, in the compressor 5 of the present embodiment, the compression work of 1 hp is saved when the compression stop mechanism 101 on the upper cylinder 69 side is operated, and the compression work of 3 hp is saved when the compression stop mechanism 101 on the lower cylinder 70 side is operated. Will be saved. When the electromagnetic stopper 103 is activated, the lock pin 109 instantaneously projects to the left. The timing at which the tip of the lock pin 109 fits into the locking recess 107 is determined by the fact that the vane 105 is moved by the rotor 77 into the upper cylinder 69 (lower cylinder 70). It is the moment when it is pushed into.
[0040]
Next, the flow of the refrigerant during the cooling operation will be described.
[0041]
The gas refrigerant sucked into the compressor 5 from the accumulator 15 via the refrigerant pipe 41 is adiabatically compressed to be a high-temperature high-pressure gas refrigerant and discharged from the compressor 5. The discharged high-pressure gas refrigerant passes through the refrigerant pipe 31, the oil separator 17, and the refrigerant pipe 32, is controlled in its course by the four-way valve 9, and then flows into the outdoor heat exchanger 11 through the refrigerant pipe 33. The high-temperature and high-pressure gas refrigerant is cooled by the outside air while passing through the outdoor heat exchanger 11 and condensed to become a liquid refrigerant, and then the electric expansion of each indoor unit 3 via the refrigerant pipes 34 to 36. It flows into the valve 21.
[0042]
After the flow rate of the liquid refrigerant is controlled by the electric expansion valve 21, the liquid refrigerant flows into the indoor heat exchanger 23, and is vaporized while passing through the indoor heat exchanger 23 to become a gas refrigerant. Cools the blown room air. At this time, the indoor ECU 52 controls the number of revolutions of the electric fan 7 based on the deviation between the set temperature and the room temperature, and determines that the deviation between the inlet-side refrigerant temperature and the outlet-side refrigerant temperature of the indoor heat exchanger 23 is a predetermined value ( For example, the opening amount of the electric expansion valve 21 (the number of steps of the stepping motor for driving the valve body) is controlled so as to be 0 to 1 ° C.).
[0043]
The gas refrigerant vaporized in the indoor heat exchanger 23 flows into the accumulator 15 via the refrigerant pipes 37 to 39, the four-way valve 9, and the refrigerant pipe 40, and is sucked into the compressor 5 again from the refrigerant pipe 41.
[0044]
On the other hand, during the heating operation, the four-way valve 9 is switched as shown by the broken line, and the flow of the refrigerant is also opposite to that during the cooling operation, as shown by the broken arrow. That is, the high-temperature high-pressure gas refrigerant discharged from the compressor 5 is introduced into the indoor heat exchanger 23, and then condensed into a liquid refrigerant while passing through the indoor heat exchanger 23, and the electric fan is condensed by latent heat of condensation. 25 heats the blown indoor air. Next, the liquid refrigerant flows into the outdoor heat exchanger 11, is heated by the outside air while passing through the outdoor heat exchanger 11, evaporates and turns into a gas refrigerant, and then flows from the accumulator 15 to the compressor 5. It is inhaled again.
[0045]
Hereinafter, the procedure of the capability control in the present embodiment will be described with reference to the schematic diagrams of FIGS. In the schematic diagram, for convenience of explanation, the upper cylinder 69 and the lower cylinder 70 are vertically arranged, and further, the difference in volume is shown in a planarized manner. When the operation of the air conditioner is started, the outdoor ECU 51 determines the target compression work based on the input signal from each indoor ECU 52, and starts the compressor 5 (turns on the start magnet switch). ) Together with power saving control and compression stop control.
[0046]
That is, as shown in FIG. 14, when the target compression work is 4 hp, the outdoor ECU 51 opens the first electromagnetic valve 27 and turns off the electromagnetic stopper 103. Then, since the power saving mechanism 81 and the compression stop mechanism 101 do not operate together, as shown in the schematic diagram of FIG. 6, prescribed compression work is performed in both the cylinder chambers 73 and 75 of the compressor 5, and the outdoor work is performed. The unit 1 performs a compression work of 4 horsepower.
[0047]
When the target compression work is 3.5 horsepower, the outdoor ECU 51 shuts off the first solenoid valve 27 and switches the second solenoid valve 29 to the third position. Then, the gas refrigerant flows out of the compression space 123 of the upper cylinder chamber 73 into the suction space 121 of the lower cylinder chamber 75 as shown in the schematic diagram of FIG. Horsepower is saved. As a result, for the outdoor unit 1 as a whole, 0.5 hp is reduced from 4 hp, and compression work of 3.5 hp is performed.
[0048]
When the target compression work is 3 hp, the outdoor ECU 51 opens the first electromagnetic valve 27 and drives the electromagnetic stopper 103 on the upper cylinder 69 side. Then, as shown in the schematic diagram of FIG. 8, the compression stop mechanism 101 does not perform any suction or compression of the refrigerant in the upper cylinder chamber 73, and one horsepower is saved as described above. As a result, for the outdoor unit 1 as a whole, 1 hp is reduced from 4 hp, and compression work of 3 hp is performed.
[0049]
When the target compression work is 2.5 horsepower, the outdoor ECU 51 shuts off the first solenoid valve 27 and switches the second solenoid valve 29 to the second position. Then, the gas refrigerant flows out of the compression space 123 of the lower cylinder chamber 75 into the suction space 121 of the upper cylinder chamber 73 by the power saving mechanism 81 as shown in the schematic diagram of FIG. Horsepower is saved. As a result, as a whole, the outdoor unit 1 is reduced by 1.5 horsepower from 4 horsepower, and the compression work of 2.5 horsepower is performed.
[0050]
When the target compression work is 2 hp, the outdoor ECU 51 shuts off the first solenoid valve 27 and switches the second solenoid valve 29 to the first position. Then, as shown in the schematic diagram of FIG. 10, the gas refrigerant flows from the compression space 123 of the upper cylinder chamber 73 to the suction space 121 of the lower cylinder chamber 75, while the power save mechanism 81 causes the gas refrigerant to flow out of the lower cylinder chamber 75. The gas refrigerant flows out of the compression space 123 into the suction space 121 of the upper cylinder chamber 73, and two horsepower is saved as described above. As a result, in the outdoor unit 1 as a whole, 2 hp is reduced from 4 hp, and compression work of 2 hp is performed.
[0051]
When the target compression work is 1.5 horsepower, the outdoor ECU 51 closes the first solenoid valve 27, switches the second solenoid valve 29 to the second position, and drives the electromagnetic stopper 103 on the upper cylinder 69 side. Then, the gas refrigerant flows out of the compression space 123 of the lower cylinder chamber 75 into the upper cylinder chamber 73 by the power saving mechanism 81 and the compression stop mechanism 101 as shown in the schematic diagram of FIG. No refrigerant is sucked in and compressed, saving 2.5 horsepower. As a result, as a whole, the outdoor unit 1 reduces 2.5 horsepower from 4 horsepower, and performs compression work of 1.5 horsepower.
[0052]
When the target compression work is 1 hp, the outdoor ECU 51 opens the first electromagnetic valve 27 and drives the electromagnetic stopper 103 on the lower cylinder 70 side. Then, as shown in the schematic diagram of FIG. 12, the compression stop mechanism 101 stops the suction and compression of the refrigerant in the lower cylinder chamber 75 at all, and saves three horsepower as described above. As a result, as a whole, the outdoor unit 1 is reduced by 3 hp from 4 hp and the compression work of 1 hp is performed.
[0053]
When the target compression work is 0.5 hp, the outdoor ECU 51 closes the first solenoid valve 27, switches the second solenoid valve 29 to the third position, and drives the electromagnetic stopper 103 on the lower cylinder 70 side. Then, as shown in the schematic diagram of FIG. 13, the gas refrigerant flows out of the compression space 123 of the upper cylinder chamber 73 to the lower cylinder chamber 75 by the power save mechanism 81 and the compression stop mechanism 101, and the lower cylinder chamber 75 No refrigerant is sucked and compressed, and 3.5 horsepower is saved. As a result, as a whole, the outdoor unit 1 reduces 3.5 hp from 4 hp and performs compression work of 0.5 hp.
[0054]
As described above, in the present embodiment, as shown in FIG. 14, by controlling the drive of the power save mechanism 81 and the compression stop mechanism 101, the capacity control for every 0.5 horsepower from 0.5 to 4 horsepower is performed. It was realized. In this capacity control, the energy efficiency could be improved by not performing the refrigerant return control for discarding the compression work.
[0055]
This concludes the description of the specific embodiment, but aspects of the present invention are not limited to this embodiment. For example, in the above-described embodiment, a power save mechanism and a compression stop mechanism are provided in one constant speed compressor, but a power save mechanism and a compression stop mechanism are provided in one of a plurality of constant speed compressors. It may be provided. Further, in the above embodiment, the power save mechanism and the compression stop mechanism are provided in the twin rotor type constant speed compressor. However, the power save mechanism and the compression stop mechanism may be provided in the constant speed compressor having a triple rotor or more compression mechanism. . Further, as the power saving mechanism, for example, various structures such as providing a communication circuit and an electromagnetic valve outside the compressor casing are conceivable, and the amount of saving can be freely set. Further, a high-pressure refrigerant gas may be used as a drive source of the compression stop mechanism. In addition, the specific configuration of the refrigerant circuit and the like can be appropriately changed without departing from the spirit of the present invention.
[0056]
【The invention's effect】
As described above, according to the present invention, since the power saving mechanism and the compression stop mechanism are provided in the multiple rotor type constant speed compressor in which the displacement volumes of the compression elements are different from each other, the refrigerant return control for discarding the compression work is performed. , Multi-stage capacity control can be performed without performing, and energy efficiency can be improved.
[Brief description of the drawings]
FIG. 1 is a refrigerant and electric circuit diagram showing an embodiment of an air conditioner according to the present invention.
FIG. 2 is a half vertical sectional view showing a structure of a power saving mechanism.
FIG. 3 is a sectional view taken along line AA in FIG. 2;
FIG. 4 is a half cross-sectional view showing a non-operation state of a compression stop mechanism.
FIG. 5 is a half cross-sectional view showing an operation state of a compression stop mechanism.
FIG. 6 is a schematic view showing the operation of the embodiment.
FIG. 7 is a schematic view showing the operation of the embodiment.
FIG. 8 is a schematic view showing the operation of the embodiment.
FIG. 9 is a schematic diagram illustrating the operation of the embodiment.
FIG. 10 is a schematic view showing the operation of the embodiment.
FIG. 11 is a schematic view showing the operation of the embodiment.
FIG. 12 is a schematic view illustrating the operation of the embodiment.
FIG. 13 is a schematic view illustrating the operation of the embodiment.
FIG. 14 is a diagram showing the relationship between the target compression work and the operation of each mechanism.
[Explanation of symbols]
1 outdoor unit
3 indoor units
5 Compressor
27 1st solenoid valve
29 2nd solenoid valve
51 Outdoor ECU
69 Upper cylinder
70 Lower cylinder
77, 79 rotor
81 Power Save Mechanism
101 Compression stop mechanism
103 Electromagnetic stopper
105 Vane
121 Inhalation space
123 compression space

Claims (4)

It has a plurality of compression elements including a rotor that rotates eccentrically in a cylinder and a vane that slides on the outer peripheral surface of the rotor to define a suction space and a compression space, and the plurality of compression elements have different displacement volumes. A double-rotor compressor,
A communication path for communicating the compression space in one compression element with the suction space in the other compression element at a predetermined phase, a shutoff valve for shutting off the flow of fluid in the communication path, and provided in the communication path; A compressor comprising power save means comprising a check valve for allowing fluid to pass in only one direction. It has a plurality of compression elements including a rotor that rotates eccentrically in a cylinder and a vane that slides on the outer peripheral surface of the rotor to define a suction space and a compression space, and the plurality of compression elements have different displacement volumes. A double-rotor compressor,
A compressor provided with at least one of the compression elements and having a compression stop means for communicating a suction space and a compression space of the compression element. It has a plurality of compression elements including a rotor that rotates eccentrically in a cylinder and a vane that slides on the outer peripheral surface of the rotor to define a suction space and a compression space, and the plurality of compression elements have different displacement volumes. A double-rotor compressor,
A communication path for communicating the compression space in one compression element with the suction space in the other compression element at a predetermined phase, a shutoff valve for shutting off the flow of fluid in the communication path, and provided in the communication path; Power save means consisting of a check valve that allows fluid to pass only in one direction;
A compressor provided in at least one of the compression elements and comprising compression stop means for communicating a suction space and a compression space of the compression element. An air conditioner comprising the compressor according to claim 1.

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